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Nepenthes singalana Yellowing Leaf Margins

Good morning Terra Forums,

I revamped my terrarium this summer, and I don't think I did it correctly, which is something I am coming to terms with gradually. I'm still figuring out how to help my plants transition successfully, if they can at all. My N. ventricosa and N. alata have bounced back beautifully, but they're pretty bomb proof, so that doesn't mean much at all.

The one I am focusing on next is my N. singalana. It pitchered well for me before (of course, when I didn't even have a thermometer in my tank and didn't give it any special treatment) but since the transition, it has not pitchered. And now- the past few leaves it has put out have a yellow leaf margin. I believe this is a sign of nutrient deficiency, so should I try foliar feeding on the leaves? Coffee through the soil? It has no pitchers, so, feeding the "normal" way is impossible.

Conditions:Temps: Mid to high 70's during the day, trying to keep it more mid, but it can be tricky. It absolutely never even reaches 80. Lower sixties at night.Humidity: 50-60% during the day, 90-100% at nightLight: A mess, haha. It is in the back of my grow chamber, and from the back to the front the bulbs are in this order- 1 T5HO, 1 T8 17 watt 5,500K, 1 T8 17 watt 10,000K, 2 T12 20 watt 6,500K, all 24" tube fluorescents.
The plant in question is roughly 5-6" from light source.

I greatly appreciate any advice anyone can give. This is a beautiful species, and I want to do all I can to give it the best conditions I can until I build a grow shelf- whenever that is.

Thank you for the consideration! I don't believe its over-watering, I don't water until I can see the soil looks a bit dry (or if I have lifted it up for inspection and I feel its on the light side). So, if anything, I keep the poor thing TOO dry.

I do have fans.

One is probably too small- only 1.5" across which provides just a little air circulation during the day.
At night, I have a Fog Box, (A Tupperware container with an ultrasonic fogger in it, with input and output tubes, the input tube has a fan which draws air from outside of into the tank) the fan of which runs for a few hours each night after the lights go off.

Maybe the soil is too compact? It is peat based after all- something like 2:2:1:1 peat: perlite: orchid bark:LFS. Perhaps a media change is in order, something more like 1:1:1 LFS: perlite: Orchid bark?

The soil change sounds good, the mix you mention is the same I'm using now and the plants seem to like it more than just pure LFS.

Maybe you have a pest in your terrarium like thrips or something. Try and take a close look and see if you can see anything moving on the plant, in the soil or on the brim of the pots. Maybe use a magnifying glass, however I find I can see them with my naked eye if I look really close and not blink for a bit lol. If you have pests you can fight them with solutions or use other insects to kill them. Let us know if you see anything.

Hey! Sorry for the delay, (tis the season for end-of-semester Finals, you know how it is!) but I have my N. singalana here and Im not seeing any mites or anything. Just to be safe, I will probably treat it with a low-concentration of Neem oil while repotting it when next week, when I get home.

So, the yellowing leaves may be a factor of root compression, and inefficient uptake of the trace elements found therein, and maybe even water, and not of, say, too much or too little light? The leaf looks fairly well formed otherwise.

See for yourself (Im trying to get out of the way of my computer's camera, hahaha)

I'm still trying to get it to pitcher, and right now it is growing at a snail's pace. I have repotted it into a 1:1:1 orchid bark : perlite : LFS, and into a bigger pot (back in January). I also have a layer of living LFS on top, which seems pretty healthy and really enjoying its home, as you can see here:

How far is it from the light (which is the same as described above):

The whole view (the leaf coming nearly straight at the camera is the one that had yellow margins in the photos above. It greened up, certainly, but the growing tip is taking its sweet time!)

Close up of the growing tip

So while the moss is happy, the plant, obviously, is a little bit less than so. it hasn't pitchered in a while, and the growing conditions are the same as I have them written above, except perhaps closer to the lights. I have been thinking of injecting some coffee into the soil, or dilute fertilizer (since I heard that coffee doesn't have as much of an effect on N. singalana as it does with others).